DE2729719C2 - Device for the transmission of high frequency signals - Google Patents

Description

one of the AHF cables is forwarded 30 to the amplifier and from there to the other at an increased level AHF cable fed back from which it is to

Transmission of high-frequency signals (HF devices can continue to be used, of which a transmitter to a receiver is possible because only one frequency is DrinziDiell wireless or wired. This is, according to s.ch, the further advantage that _is, in areas Kose About ™ g _t f _S p _e lsweise for round which the distance without obstacles proceeds, on radio and television _o d _e r even with radiotelephone equipment 40 wireless Betneb can be passed, Angew Sde. e One embodiment of the subject matter of the invention is for example the use of high-frequency cables (AHF cables) shown in the drawings, which are shown schematically in FIG . Gera-InS-von ScEenanlagen are laid and on the one hand with transmitting and receiving systems, which are to move along an example for the transmission of television signals in the railway given route 45 s.nd, in ftSgbereich serve? The wireless transmission of FIG. 2 is one of these devices with enlarged dimensions

tuneder · WeUenkästöSes obstacle in the way of fig. 3 also shows the device schematically

such obstacles occur, for example, with two cables according to the invention,

rail-bound vehicles through tall buildings 50 1 denotes a route along which two

or in tunnels, if the tunnels are very long devices 2 and 3 are moved so that both with

or the railroad is strongly curved. If a transmitting and receiving system for HF signals

then at the beginning and at the end of one along this s.nd. The route 1 is supposed to be an example of a

Sdüenenweges to be moved train receiving and nelstreet in a mine, and the devices 2 and

Transmitting systems are arranged, which are correct with each other 55 3 two, locomotives at the beginning and at the end

should spond, then that of a train is appropriate in these areas. These two devices 2 and

üWagungsweg interrupted and the entire AnIa- 3 should be constantly on their transmitting and receiving systems

ge S dfmit no longer functional. Attempts that are in contact with each other so that one ger «too

Transmission at these points can be controlled or influenced by the other by means of an AHF-Ka-

bels aSizu get, have no usable 60 can. As long as route 1 is straight or only weak

Result led, since in this way none is sufficiently curved, em such a contact is wireless

strong signal can be transmitted from transmitter to receiver. However, as soon as the route corresponds to the

IX / Ol * flf * Π Κί) ΠΠ 'dl ÖLwIIIhIII ^ 111 1 I £ ρ · * O

In the known device according to DE-OS, the is indicated by the dash-dotted line 4

23 22 921 is interrupted to achieve a sufficiently strong 65 level transmission path and the HH-M-

A AHF signal can no longer be sent from device 2 to device 3 or

Cable laid, at the end of which a frequency converter is reversed and an amplifier are attached. In the frequency- To avoid these nights, see and accordingly-

accordingly according to the invention along the route 1, two AHF cables 5 and 6 are laid parallel to one another, the corresponding the representation in Fi g. 3 are connected to one another at one end via an amplifier 7. At the free ends, these AHF cables can be terminated via their wave resistors so that they can be used on the line no refections bz-Λ. standing waves form.

The two AHF-Kabe! 5 and 6 are placed along the specified route, for example on the tunnel wall, Laid parallel to each other at a certain distance. This distance is to be chosen so that the coupling attenuation between the two AHF cables is always greater than the gain of the RF signals through the amplifier 7. The two cables are preferably in the area of the antennas 8 of the Devices 2 and 3 relocated so that the coupling loss between this antenna and the two cables is so low can be kept as possible. If from one of the devices 2 or 3 a signal to the other Device is to be sent, then this signal is fed into the AHF cable 5, for example, and on This cable is forwarded to amplifier 7. The amplifier increases the level of the signal and the signal is then fed into the cable 6 at an increased level and can there from the receiving system of the other device can be received properly.

The design of the AHF cables 5 and 6 is arbitrary. It can be all suitable ones available on the market AHF cables can be used. Such cables are, for example, coaxial AHF cables in which the outer conductor has one or more slots or holes. The outer conductor can also be in the form of an open Be executed helix. Such cables are not just for the transmission and emission of RF signals suitable, but it is also possible to feed this cable into the same RF energy at each point can then also be removed at any other point.

1 sheet of drawings

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Claims (2)

converter, the signal fed into the cable is converted to another frequency and amplified again - _m the cable fed in with this second frequency draws, frequencies are interpreted and also the frequency The fact that there are two parallel converters along the route (1) makes the entire device more expensive SÄiÄÄS " ^G The invention is based on the object of specifying a pre-LdübeV the amplifiers (7) with each other device of the type described above, mn hand uDeraenven.idrK.ci _v , ^ ^ simple way with the usual send and receive - S aTeiden high frequency cables (5, 6) depend on perfect reception of HF-Si are laid with one another so that the coupling signals are possible at every point of a given route. SSSi-A iStoKd-ln CS. R * B «· 20 borrowed, regardless of how strongly curved this if the signal is amplified through the route or how long the tunnel is ais aie yersx <uK.uii _B * ₆ ^^ Task is marked according to the stronger 17) ^ _{features of} claim 1 are solved 2 device according to claim 1. characterized marked- The advantage of this device is to be seen in the fact that counting the high frequency cables (5, 6) on ih- 25 by using the two parallel to each other remfrei ι end with their wave impedance running off AHF cable the influence of the coupling vapor rem treien tnae mn inrein w _ö ^ ^ ^ _{transmission path is} reduced. That closed sina. The signal sent _{by one of the transmitters is over}